266653461612640 has 288 divisors, whose sum is σ = 692695052532000. Its totient is φ = 96867682222080.

The previous prime is 266653461612547. The next prime is 266653461612649. The reversal of 266653461612640 is 46216164356662.

It is a super-2 number, since 2×266653461612640² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266653461612649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2278232520 + ... + 2278349560.

It is an arithmetic number, because the mean of its divisors is an integer number (2405191154625).

Almost surely, 2^{266653461612640} is an apocalyptic number.

266653461612640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266653461612640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346347526266000).

266653461612640 is an abundant number, since it is smaller than the sum of its proper divisors (426041590919360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266653461612640 is a wasteful number, since it uses less digits than its factorization.

266653461612640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118818 (or 118793 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 58.

The spelling of 266653461612640 in words is "two hundred sixty-six trillion, six hundred fifty-three billion, four hundred sixty-one million, six hundred twelve thousand, six hundred forty".